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Motore di ricerca datesheet componenti elettronici |
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Motore di ricerca datesheet componenti elettronici |
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LM5122MHX/NOPB Scheda tecnica(PDF) 8 Page - Texas Instruments |
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LM5122MHX/NOPB Scheda tecnica(HTML) 8 Page - Texas Instruments |
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8 / 49 page  8 LM5122, LM5122-Q1 SNVS954G – FEBRUARY 2013 – REVISED MAY 2016 www.ti.com Product Folder Links: LM5122 LM5122-Q1 Submit Documentation Feedback Copyright © 2013–2016, Texas Instruments Incorporated Electrical Characteristics (continued) Unless otherwise specified, these specifications apply for –40°C ≤ TJ ≤ +125°C, VVIN = 12 V, VVCC = 8.3 V, RT = 20 kΩ, no load on LO and HO. Typical values represent the most likely parametric norm at TJ = 25°C, and are provided for reference purposes only. PARAMETER TEST CONDITIONS MIN TYP MAX UNIT OPT Synchronization selection threshold OPT rising 2.0 3.0 4.0 V SLOPE COMPENSATION SLOPE output voltage 1.17 1.20 1.23 V VSLOPE Slope compensation amplitude RSLOPE = 20 kΩ, fSW = 100 kHz, 50% duty cycle, TJ = –40ºC to +125ºC 1.375 1.650 1.925 V RSLOPE= 20 kΩ, fSW= 100 kHz, 50% duty cycle, TJ = 25ºC 1.400 1.650 1.900 V SOFT-START ISS-SOURCE SS current source VSS = 0 V 7.5 10 12 µA SS discharge switch RDS-ON 13 Ω PWM COMPARATOR tLO-OFF Forced LO off-time VVCC = 5.5 V 330 400 ns VVCC = 4.5 V 560 750 ns tON-MIN Minimum LO on-time RSLOPE = 20 kΩ 150 ns RSLOPE = 200 kΩ 300 ns COMP to PWM voltage drop TJ = –40ºC to +125ºC 0.95 1.10 1.25 V TJ = 25ºC 1.00 1.10 1.20 V CURRENT SENSE / CYCLE-BY-CYCLE CURRENT LIMIT VCS-TH1 Cycle-by-cycle current limit threshold CSP to CSN, TJ = –40ºC to +125ºC 65.5 75.0 87.5 mV CSP to CSN, TJ = 25ºC 67.0 75.0 86.0 mV VCS-ZCD Zero cross detection threshold CSP to CSN, rising 7 mV CSP to CSN, falling 0.5 6 12 mV Current sense amplifier gain 10 V/V ICSP CSP input bias current 12 µA ICSN CSN input bias current 11 µA Bias current matching ICSP - ICSN –1.75 1 3.75 µA CS to LO delay Current sense / current limit delay 150 ns HICCUP MODE RESTART VRES Restart threshold RES rising 1.15 1.20 1.25 V VHCP- UPPER Hiccup counter upper threshold RES rising 4.2 V RES rising, VVIN = VVCC = 4.5 V 3.6 V VHCP- LOWER Hiccup counter lower threshold RES falling 2.15 V RES falling, VVIN = VVCC = 4.5 V 1.85 V IRES- SOURCE1 RES current source1 Fault-state charging current 20 30 40 µA IRES-SINK1 RES current sink1 Normal-state discharging current 5 µA IRES- SOURCE2 RES current source2 Hiccup mode off-time charging current 10 µA IRES-SINK2 RES current sink2 Hiccup mode off-time discharging current 5 µA Hiccup cycle 8 Cycles RES discharge switch RDS-ON 40 Ω Ratio of hiccup mode off-time to restart delay time 122 |
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